Isolation switch monitoring method and network monitoring system

Abstract

The invention relates to the technical field of power equipment, and discloses an isolating switch monitoring method and a network monitoring system, which are used for effectively monitoring an isolating switch. The disconnecting switch monitoring method comprises the steps that multi-dimensional information of a disconnecting switch and related equipment thereof is collected, the multi-dimensional information comprises motor loop voltage, current, opening and closing angles, action times, video monitoring and temperature and humidity, and real-time external locking node state and motor current-opening and closing angle analogy model detection are combined; and comprehensively evaluating the working state of the disconnecting switch, and judging whether the disconnecting switch needs to be overhauled according to the working state.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to an isolating switch monitoring method and a network monitoring system. Background Art

[0002] The contact network disconnector in the rail transit power supply system plays a key role. However, its electric operation function often faces challenges such as motor failure, voltage abnormality, humidity sensitivity, locking failure and inadequate action. In order to ensure the stable operation of the system, it is urgent to realize intelligent monitoring of the equipment so as to warn potential problems in advance, avoid risks in time, and quickly identify the fault point when a fault occurs. Therefore, it is particularly important to promote the intelligent operation and maintenance of disconnectors. Summary of the invention

[0003] The embodiments of the present invention provide an isolating switch monitoring method and a network monitoring system to solve the problem that the prior art lacks effective intelligent monitoring means for isolating switches.

[0004] The first aspect of the present invention provides a disconnector monitoring method, comprising: obtaining the disconnector motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch, and temperature and humidity information of the disconnector control mechanism box; determining an associated switch related to the disconnector, wherein the associated switch is a switch device that has a direct electrical connection or logical association with the disconnector in the power grid and jointly realizes circuit isolation, protection or control functions; identifying the real-time state of the knife switch locking node corresponding to the associated switch, and obtaining external locking node information; pre-establishing an analogy relationship model between the motor current and the opening and closing angle, and predicting the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, according to the motor circuit current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time; if the measured motor current value deviates from the theoretical current value range, it is determined that the current of the motor is abnormal; based on the motor circuit voltage information, the motor circuit current information, the opening and closing angle information, the number of actions information, the video information, the temperature and humidity information, the external locking node information, and the comparison result of the motor current and the opening and closing angle, the working state of the disconnecting switch is determined; based on the working state, it is determined whether the disconnecting switch needs to be repaired.

[0005] In a feasible implementation manner, the working state of the isolating switch is determined based on the motor circuit voltage information, the motor circuit current information, the opening and closing angle information, the action number information, the video information, the temperature and humidity information, the external locking node information, and the comparison result between the motor current and the opening and closing angle, including: analyzing the motor circuit voltage information and current information to determine whether the motor is operating normally; analyzing the opening and closing angle information to determine whether the opening and closing positions of the isolating switch are accurate; analyzing the action number information to evaluate the service life of the isolating switch; analyzing the video information to identify whether there are abnormal phenomena at the knife switch; analyzing the temperature and humidity information to determine whether the environmental conditions of the isolating switch are suitable; analyzing the external locking node information to determine whether all knife switch locking nodes are in normal state; determining the working state of the isolating switch according to the analysis result and the comparison result between the motor current and the opening and closing angle.

[0006] In a feasible implementation, the analyzing of the video information and identifying whether there is any abnormality at the knife switch includes: extracting key features corresponding to the image from the video information using image processing technology; comparing the key features with normal status data in a historical database to identify any abnormality that deviates from the normal range.

[0007] In a feasible implementation, analyzing the action count information and evaluating the service life of the isolating switch includes: comparing the action count information with a preset action count threshold; if the action count approaches or reaches the preset threshold, it is evaluated that the service life of the isolating switch has approached or reached the end.

[0008] In a feasible implementation manner, the working state of the isolating switch is determined based on the analysis results and the comparison results of the motor current and the opening and closing angles, including: if the analysis results show that the motor circuit voltage or current is abnormal, the opening and closing angles are inaccurate, the analogy relationship between the motor current and the opening and closing angles shows abnormality, the service life of the isolating switch is approaching or has reached the end, there are abnormal phenomena at the knife switch, the temperature and humidity conditions exceed the safety range, or there is a knife switch locking node in an abnormal state, any one or more of the following, then it is determined that the working state of the isolating switch is abnormal; otherwise, it is determined that the working state of the isolating switch is normal.

[0009] In a feasible implementation manner, determining the associated switches related to the isolating switch includes: analyzing the topological structure of the power grid to identify the switching device that is directly electrically connected to the isolating switch; determining the switching device that is logically associated with the isolating switch based on the operating logic and control strategy of the power grid; and using the identified directly connected and logically associated switching device as the associated switch related to the isolating switch.

[0010] In a feasible implementation manner, the identification of the opening and closing status of the knife switch locking node corresponding to the associated switch to obtain the external locking node information includes: monitoring the real-time status of the knife switch locking node corresponding to the associated switch; when any knife switch locking node is detected to be in an abnormal state, recording the status information of the knife switch locking node in the abnormal state; integrating the knife switch locking node status information of all identified associated switches to obtain the external locking node information.

[0011] The second aspect of the present invention provides a network monitoring system, the network monitoring system includes a switch monitoring subsystem and an isolating switch control subsystem connected in communication, the isolating switch control system includes an isolating switch and a knife isolation control mechanism box, the network monitoring system also includes an associated switch directly connected to or logically associated with the isolating switch; the switch monitoring subsystem is used to collect the motor circuit voltage information, motor circuit current information, opening and closing angle information, number of actions information, video information at the knife switch, temperature and humidity information of the knife isolation control mechanism box, and external locking node information of the associated switch, the external locking node information includes the associated switch to The real-time status of the corresponding knife switch locking node is determined, and an analogy relationship model between the motor current and the opening and closing angle is established in advance to predict the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, according to the motor loop current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the real-time collected opening and closing angle information. If the measured motor current value deviates from the theoretical current value range, it is determined that the current of the motor is abnormal. The working status of the disconnector is determined according to the collected information and the comparison result between the motor current and the opening and closing angle, and whether the disconnector needs to be repaired is determined based on the working status.

[0012] In the technical solution provided by the present invention, the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch and temperature and humidity information of the knife control mechanism box of the isolating switch are obtained; the associated switch related to the isolating switch is determined, and the associated switch is a switch device that has a direct electrical connection or logical association with the isolating switch in the power grid and jointly realizes the circuit isolation, protection or control function; the real-time state of the knife switch locking node corresponding to the associated switch is identified to obtain the external locking node information; the analogy relationship model between the motor current and the opening and closing angle is established in advance, and the theoretical current value range of the knife switch opening and closing process is predicted. In each monitoring cycle, according to the motor circuit current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, the current of the motor is determined to be abnormal; based on the motor circuit voltage information, the opening and closing angle information, the number of actions information, the video information, the temperature and humidity information, the external locking node information, and the comparison result between the motor current and the opening and closing angle, the working state of the disconnector is determined; based on the working state, it is determined whether the disconnector needs to be repaired. In the embodiment of the present invention, by comprehensively monitoring the motor circuit voltage, current, opening and closing angle, number of actions, video information, temperature and humidity and other key parameters of the disconnector, and correlating and analyzing the locking state of the related switch equipment, the intelligent judgment and maintenance warning of the working state of the disconnector are realized, which significantly improves the efficiency and safety of power grid operation and maintenance, and reduces the risk of failure and operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of an embodiment of a disconnect switch monitoring method in an embodiment of the present invention;

[0014] Figure 2 A schematic diagram of an embodiment of the relationship between the current and the closing angle during the closing process of the isolating switch in an embodiment of the present invention;

[0015] Figure 3 A schematic diagram of another embodiment of the isolating switch monitoring method in an embodiment of the present invention;

[0016] Figure 4 A schematic diagram of an embodiment of a network monitoring system in an embodiment of the present invention;

[0017] Figure 5 A schematic diagram of another embodiment of the network monitoring system in an embodiment of the present invention;

[0018] Figure 6 It is a schematic diagram of an embodiment of a comprehensive monitoring circuit diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The embodiment of the present invention provides an isolating switch monitoring method and a network monitoring system, which comprehensively collect and analyze relevant parameters of the isolating switch to accurately evaluate the working status of the isolating switch, thereby ensuring the safe and stable operation of the power grid.

[0020] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] It is understandable that the execution subject of the present invention may be a terminal or a server, which is not specifically limited herein. The embodiment of the present invention is described by taking a server as the execution subject as an example.

[0022] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1 , an embodiment of the isolating switch monitoring method in the embodiment of the present invention includes:

[0023] 101. Obtaining the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch, and temperature and humidity information of the knife isolation control mechanism box of the isolating switch;

[0024] The voltage information of the motor circuit can be detected by a voltage transformer, which can measure and convert the voltage signal in the motor circuit in real time and convert it into an electrical signal that can be processed by the digital system; at the same time, in order to obtain the current information of the motor circuit, a current transformer can be used, which can accurately measure the magnitude and direction of the current in the circuit; the acquisition of the opening and closing angle information can be obtained by an angle sensor, which can monitor the angle change of the knife switch in real time during the opening and closing process to provide the opening and closing angle data; the number of opening and closing actions of the isolating switch can be collected by a counter, and the counter can record each opening and closing operation of the isolating switch to obtain the cumulative number of actions; further, the opening and closing auxiliary contacts of the isolating switch can also be detected, and the number of opening and closing actions of the isolating switch can be calculated by obtaining the opening and closing times of the opening and closing auxiliary contacts; the video information at the isolating switch knife switch can be obtained by a camera, and the camera can capture the operation process of the isolating switch knife switch in real time; the temperature and humidity sensor installed in the isolating knife control mechanism box can be used to detect the temperature and humidity of the isolating knife control mechanism box, and the temperature and humidity sensor can monitor the temperature and humidity changes in the isolating knife control mechanism box in real time.

[0025] 102. Determine the associated switches related to the isolating switch. The associated switches are switch devices that are directly electrically connected or logically associated with the isolating switch in the power grid and jointly realize circuit isolation, protection or control functions;

[0026] In the power grid, the isolating switch does not exist in isolation. There are direct or indirect electrical connections and logical associations between the isolating switch and other switch devices. In order to more accurately determine the working status of the isolating switch, it is necessary to determine the switch devices that have direct electrical connections or logical associations with it, that is, the associated switches. According to the topological structure diagram of the power grid and the electrical connection relationship between the switch devices, combined with the logical association information, a comprehensive analysis can be performed to automatically determine the associated switches through algorithms.

[0027] 103. Identify the real-time status of the switch locking node corresponding to the associated switch and obtain the external locking node information;

[0028] By identifying the control circuit where the knife switch locking node corresponding to the associated switch is located, the opening and closing status of each knife switch locking node on these control circuits can be obtained to obtain the external locking node information. When external conditions cause any knife switch locking node to be disconnected, this change can be immediately captured and a corresponding electrical signal can be generated.

[0029] The associated switches associated with the disconnector may be grounding switches, circuit breaker switches, etc. For example, the real-time status of the knife switch locking nodes of the grounding switches at both ends of the contact network and the knife switch locking nodes of the circuit breaker can be collected in real time. The status of these nodes directly reflects the current operating status of the associated switches.

[0030] Furthermore, in the process of collecting and processing node status information, multiple checks and comparisons can be performed to eliminate possible false alarms or interference. At the same time, once any abnormality or failure is detected, the alarm mechanism can be immediately triggered to notify the operation and maintenance personnel to handle it.

[0031] 104. Establish an analogy relationship model between the motor current and the opening and closing angle in advance and predict the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, compare the measured motor current value with the theoretical current value range corresponding to the opening and closing angle information collected in real time according to the motor circuit current information and the opening and closing angle information. If the measured motor current value deviates from the theoretical current value range, it is determined that the motor current is abnormal.

[0032] A large amount of historical data on knife switch opening and closing operations is collected in advance, including motor current values, operation time, and environmental conditions corresponding to different opening and closing angles. These data are used to train and optimize the analogy relationship model between motor current and opening and closing angles. A machine learning algorithm is used to establish a mathematical relationship between motor current and opening and closing angles. The machine learning algorithm includes but is not limited to support vector machines, neural networks, or random forests. These algorithms can handle nonlinear relationships and extract corresponding features from large amounts of data. When training the model, cross-validation and other techniques are used to ensure the generalization ability of the model and avoid overfitting.

[0033] After the model training is completed, the model is used to predict the theoretical current value range of the knife switch opening and closing process at different opening and closing angles. The opening and closing angles are used as input, and the corresponding current value is calculated through the model, and a certain error range is considered to obtain the theoretical current value range. In order to ensure the accuracy and reliability of the model, the model can be verified and updated regularly, such as using new data to test the performance of the model and adjusting the parameters and structure of the model as needed.

[0034] In each monitoring cycle, the actual motor current value will be compared with the theoretical current value range predicted in advance by the analogy model based on the opening and closing angle information collected by the sensor in real time and the motor current value measured in real time. When it is found that the actual motor current value deviates from the theoretical current value range, it is determined that the motor current is abnormal, indicating that the knife switch mechanism has an abnormality during the opening and closing process, and staff need to intervene for inspection and maintenance to prevent accidents.

[0035] For example, Figure 2As shown in the figure, during the closing process, the motor current can be divided into three stages. The first stage is the motor starting stage. During the starting process, the motor is a resistor. At this time, the current rises rapidly from zero. Under the action of the Ampere force, the motor starts to rotate. During the rotation of the motor, a reverse induced electromotive force is generated to offset the voltage at both ends of the motor. At this time, the motor current will drop, and soon the motor will rotate smoothly, and the current will also tend to be stable; the second stage is the knife switch closing stage. During the knife closing process, the front part is the contact is no-load, and the motor current is relatively stable. When the moving contact and the static contact are in contact, the moving contact is instantly subjected to a large resistance, and the motor speed will decrease rapidly. The reverse induced electromotive force generated by the motor will decrease rapidly, causing the current to increase rapidly. As the contact area between the moving contact and the static contact increases during the closing process, the resistance to the rotation of the moving contact is also slowly increasing, and then the current will slowly increase; the third stage is the knife switch closing stage. When the closing is completed, the motor is powered off and the motor begins to decelerate rapidly. During the deceleration process, there will also be an induced electromotive force, thereby generating a directional current.

[0036] 105. Determine the working state of the disconnector based on the motor circuit voltage information, the motor circuit current information, the opening and closing angle information, the number of actions information, the video information, the temperature and humidity information, the external locking node information, and the comparison result between the motor current and the opening and closing angle;

[0037] Based on the collected motor circuit voltage information, motor circuit current information, opening and closing angle information, action times information, video information, temperature and humidity information, and external locking node information, it is necessary to use data analysis algorithms and machine learning models to conduct a comprehensive evaluation of the working status of the disconnector. Use data analysis algorithms to process and analyze the motor circuit voltage information and current information. For example, calculate statistics such as the average, standard deviation, maximum, and minimum values ​​to determine whether the motor is operating normally. By comparing the current data with historical data or standard values, identify abnormal data. For example, when the current suddenly increases or the voltage fluctuates beyond the normal range, it can be determined that the motor is overloaded or short-circuited. Based on the opening and closing angle information, it can be determined whether the position of the disconnector is in place. The opening and closing angle information is used to determine the opening and closing angle values ​​of the disconnector during operation. According to the monitored end angle value, feedback is given to determine whether the disconnector is open or closed to determine whether there is a fault. Through the disconnector The service life of the disconnector can be evaluated by the number of actions. At the same time, through machine learning models, historical data and failure cases are used for training to predict potential failures and remaining service life of the disconnector. Video information can quickly determine whether there is any abnormality in the disconnector by intuitively displaying the position status of the disconnector. Temperature and humidity information can be used to evaluate the suitability of the operating environment of the disconnector. Excessively high or low temperature and humidity may cause equipment performance degradation or accelerated aging. External locking node information ensures that the disconnector cannot be misoperated under specific conditions (such as during maintenance). Its status monitoring helps to detect illegal operation attempts or locking mechanism failures, thereby comprehensively improving the accuracy and comprehensiveness of the disconnector working status evaluation.

[0038] In addition, historical data and fault cases can also be used to train machine learning models. These data include but are not limited to motor circuit voltage and current data, opening and closing angle data, action count data, video data, temperature and humidity data, and external locking node data; through feature extraction and feature selection, feature information useful for evaluating the working status of the disconnector is extracted from the original data; supervised learning algorithms or deep learning algorithms are used to model and classify feature information, thereby completing the training of the machine learning model.

[0039] The collected motor circuit voltage information, motor circuit current information, opening and closing angle information, number of actions information, video information, temperature and humidity information, external locking node information, and the comparison results of motor current and opening and closing angle are input into the trained machine learning model to obtain the working status evaluation results of the disconnector.

[0040] Through comprehensive evaluation, the operating status of the disconnector can be divided into normal, abnormal or fault levels.

[0041] 106. Determine whether the isolating switch needs maintenance based on the working status.

[0042] If the working status is judged to be abnormal, such as abnormal voltage fluctuation or current overload in the motor circuit, the opening and closing angle deviates from the preset range, the number of operations exceeds the preset threshold, the video shows that the disconnector has signs of abnormal operation or damage, or the temperature and humidity exceed the safe range, and the external locking node status is abnormal, etc., these will become warning signals triggering maintenance; based on the severity and duration of these abnormal conditions, it can be further determined whether the disconnector needs immediate maintenance or is planned for preventive maintenance at some point in the future to ensure the safe and stable operation of the power grid.

[0043] In the embodiment of the present invention, by obtaining the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch and temperature and humidity information of the knife isolation control mechanism box of the isolation switch, the associated switch related to the isolation switch is determined, the associated switch is a switch device that has a direct electrical connection or logical association with the isolation switch in the power grid and jointly realizes the circuit isolation, protection or control function, the real-time state of the knife switch locking node corresponding to the associated switch is identified, the external locking node information is obtained, the analog relationship model between the motor current and the opening and closing angle is established in advance, and the theoretical current value range of the knife switch opening and closing process is predicted. In each monitoring cycle, according to the motor circuit current The actual motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the actual motor current value deviates from the theoretical current value range, the motor current is judged to be abnormal. Based on the motor circuit voltage information, opening and closing angle information, number of actions, video information, temperature and humidity information, external locking node information, and the comparison results of motor current and opening and closing angle, the working status of the disconnector is determined, and whether the disconnector needs maintenance is judged based on the working status. Intelligent judgment and maintenance warning of the working status of the disconnector are realized, which significantly improves the efficiency and safety of power grid operation and maintenance, and reduces the risk of failure and operation and maintenance costs.

[0044] See also Figure 3 Another embodiment of the isolating switch method in the embodiment of the present invention includes:

[0045] 301. Obtaining the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch, and temperature and humidity information of the knife isolation control mechanism box of the isolating switch;

[0046] The execution process of step 301 is similar to the execution process of step 101, and will not be described again here.

[0047] 302. Determine the associated switches related to the isolating switch. The associated switches are switch devices that are directly electrically connected or logically associated with the isolating switch in the power grid and jointly realize circuit isolation, protection or control functions;

[0048] Analyze the topological structure of the power grid and identify the switchgear that is directly electrically connected to the isolating switch; determine the switchgear that is logically associated with the isolating switch based on the operation logic and control strategy of the power grid; and use the identified directly connected and logically associated switchgear as associated switches related to the isolating switch.

[0049] The topology of the power grid is a graphical representation method that shows the connection relationship between various devices in the power grid. By viewing the topology, the switchgear that is directly electrically connected to the disconnector can be intuitively identified. These connections are usually reflected by lines, and the two ends of the line are connected to different switchgear. In addition to the graphical topology, the power grid usually maintains a database containing device information and connection relationships. By querying this database, detailed information about the switchgear directly connected to the disconnector can be obtained, including device name, model, location, etc. The operation logic of the power grid is usually reflected in the dispatching automation system or protection control system. These systems define the operation sequence and conditions of various switchgear according to the operating status of the power grid and the functions to be achieved. By analyzing these logics, the switchgear that has a logical association with the disconnector can be identified. These associations may include interlocking relationships, interlocking relationships, or standby relationships. Among them, interlocking relationships, such as one switch can only operate another switch after it is turned on, interlocking relationships, such as two switches cannot be turned on at the same time, and standby relationships, such as when one switch fails, the other switch serves as a standby. In addition to the operating logic, the control strategy of the power grid may also affect the association between switching devices. For example, in certain circumstances, in order to protect the stability and security of the power grid, it may be necessary to set certain switching devices to a specific state or operating sequence. These control strategies are usually reflected in the dispatching instructions or protection settings of the power grid.

[0050] 303. Identify the real-time status of the switch locking node corresponding to the associated switch and obtain the external locking node information;

[0051] Monitor the real-time status of the knife switch locking nodes corresponding to the associated switches; when any knife switch locking node is detected to be in an abnormal state, record the status information of the knife switch locking node in the abnormal state; integrate the knife switch locking node status information of all identified associated switches to obtain external locking node information.

[0052] External locking node information can be obtained by installing status monitoring sensors on the knife-locking node of each associated switch. These sensors can sense the opening and closing status of the knife-locking node in real time, thereby realizing accurate monitoring of the node status. After obtaining the status information of the knife-locking node of each associated switch, the information is further integrated and processed to obtain comprehensive external locking node information.

[0053] 304. Preliminarily establish an analogy relationship model between the motor current and the opening and closing angle and predict the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, based on the motor circuit current information and the opening and closing angle information, compare the measured motor current value with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, it is determined that the motor current is abnormal.

[0054] The execution process of step 304 is similar to the execution process of step 104, and will not be described again here.

[0055] 305. Analyze the motor circuit voltage information, motor circuit current information, opening and closing angle information, temperature and humidity information, and external locking node information;

[0056] Analyze the voltage and current information of the motor circuit to determine whether the motor is operating normally; analyze the opening and closing angle information to determine whether the opening and closing positions of the disconnector are accurate; analyze the video information to identify whether there are abnormal phenomena at the knife switch; analyze the temperature and humidity information to determine whether the environmental conditions of the disconnector are suitable; analyze the external locking node information to determine whether all knife switch locking nodes are in normal state;

[0057] Voltage data is mainly used to reflect whether there are abnormal network voltage fluctuations or over- or under-voltage hazards during the operation of the disconnector equipment to ensure that the circuit power supply status is normal. Therefore, it is necessary to judge whether the voltage data is stable and within the normal range based on the motor circuit voltage information. In addition, under normal circumstances, the standard current of the disconnector when opening and closing is about 0.6A. If the current surges abnormally based on the motor circuit current information, exceeding the range of the standard value plus the allowable error value, it may mean that the disconnector equipment has mechanical parts stuck, contacts stuck, or conductive grease is not applied to the contact point. The comprehensive analysis of voltage and current information can accurately determine whether the motor is in normal operation.

[0058] If the voltage is stable and within the normal range, and the current data also meets the standard value and the allowable error range, it can be considered that the motor is in normal operation; conversely, if the voltage or current data is abnormal, such as excessive voltage fluctuations or abnormally high current, it can be determined that the motor is in an abnormal operating state.

[0059] In the process of the disconnector from closing to opening, its angle value should show an increasing trend, and from opening to closing, it should decrease. Under normal operating conditions, the terminal angle value of the disconnector should be controlled within the preset allowable range; if the terminal angle value determined based on the opening and closing angle information is lower than the preset allowable range, it indicates that the disconnector may not be completely opened or closed due to mechanical jamming and other reasons. On the contrary, if the terminal angle value exceeds the allowable range, it may mean that the disconnector is opened or closed excessively due to problems such as mechanical limit fallback. Therefore, by accurately analyzing the opening and closing angle information and comparing it with the preset allowable range, it is possible to accurately determine whether the opening and closing positions of the disconnector are accurate.

[0060] The temperature and humidity information is analyzed, and the temperature data and humidity data in the cooling and humidity information are compared with the corresponding ideal temperature range and ideal humidity range respectively. If the temperature data exceeds the ideal temperature range or the humidity data exceeds the ideal humidity range, it is determined that the environmental conditions of the isolation switch are not suitable.

[0061] If it is determined based on the external locking node information that at least one knife gate locking node is in an abnormal state, it is determined that not all knife gate locking nodes are in a normal state; otherwise, it is determined that all knife gate locking nodes are in a normal state.

[0062] 306. Analyze the video information to identify whether there is any abnormality at the knife switch;

[0063] Image processing technology is used to extract key features corresponding to the image from the video information; the key features are compared with the normal state data in the historical database to identify any abnormal phenomena that deviate from the normal range.

[0064] To analyze the video information, image processing technology can be used to extract key features corresponding to the image in the video information. The key features include but are not limited to the position, shape and state of the knife switch, and the machine learning algorithm is used to analyze the extracted key features. The key features are compared with the normal state data in the historical database to identify any abnormal phenomena that deviate from the normal range. The abnormal phenomena include but are not limited to inaccurate knife switch position, overheating of contacts or mechanical jamming.

[0065] The background difference method or the frame difference method can be used to separate the motion area from the video stream, and then the edge detection algorithm is used to depict the outline of the knife switch, and the position and shape of the knife switch are determined by the contour matching technology; at the same time, the infrared imaging technology combined with the threshold segmentation algorithm is used to identify the temperature anomaly in the contact area, and the contact state is evaluated by calculating the temperature distribution histogram, so as to comprehensively extract the key features of the knife switch and the contact. In addition, a deep learning model can be used to perform feature representation learning on the extracted key features such as the position, shape and contact state of the knife switch, and the learned feature vector is calculated with the normal state feature vector in the historical database for cosine similarity or Euclidean distance calculation. By setting a threshold, it is determined whether the similarity or distance between the current feature vector and the normal state feature vector exceeds the normal range, so as to identify abnormal phenomena such as inaccurate knife switch position, overheated contacts or mechanical jamming.

[0066] 307. Analyze the number of actions and evaluate the service life of the disconnector;

[0067] The action number information is compared with a preset action number threshold; if the action number approaches or reaches the preset threshold, it is evaluated that the service life of the disconnector is approaching or reaching the end.

[0068] For example, assuming that the design life of the disconnector is 10,000 opening and closing operations, when the number of operations reaches or approaches 10,000 times, it is assessed that the service life of the disconnector is approaching or has reached the end.

[0069] When it is assessed that the service life of the isolating switch is approaching or has reached the end, an alarm message is sent to the operation and maintenance terminal. After receiving the alarm, the operation and maintenance personnel will immediately inspect and evaluate the equipment. If it is found that the performance of the equipment has begun to decline, or there are obvious signs of failure, the isolating switch needs to be replaced in time to avoid safety accidents or power outages caused by equipment failure.

[0070] 308. Determine the working state of the disconnector according to the analysis result and the comparison result between the motor current and the opening and closing angle;

[0071] If the analysis results show any one or more of the following: abnormal motor circuit voltage or current, inaccurate opening and closing angles, abnormal analogy between motor current and opening and closing angles, the service life of the disconnector is approaching or has reached the end, abnormal phenomena exist at the knife switch, temperature and humidity conditions exceed the safety range, or the knife switch locking node is in an abnormal state, then the working state of the disconnector is determined to be abnormal; otherwise, the working state of the disconnector is determined to be normal.

[0072] 309. Determine whether the isolating switch needs maintenance based on the working status.

[0073] When the working status is specifically manifested as abnormal voltage or current in the motor circuit, the motor circuit should be checked immediately, including the power input, wiring terminals, fuses and the motor itself, to confirm whether there is a short circuit, open circuit or overload. If necessary, repair or replace damaged parts to ensure stable operation of the motor; when the working status is specifically manifested as inaccurate opening and closing angles, the operating mechanism of the disconnector needs to be checked in detail, including transmission parts, limit devices and opening and closing indicators, etc., and adjusted to the opening and closing angles required by the design, and tested to confirm the operational flexibility and accuracy; when the analogy relationship between the motor current and the opening and closing angles shows an abnormality, the operation of the disconnector should be suspended to ensure that the equipment is in a safe state to prevent the abnormal state from further expanding or causing damage to the equipment, and conduct detailed analysis and troubleshooting to find out the cause of the abnormality and take necessary repair measures to ensure the safe and reliable operation of the disconnector; when the working status is specifically manifested as the service life of the disconnector is approaching or reaching the end, the disconnector should be comprehensively inspected and evaluated, including the wear and aging of its mechanical parts, electrical parts and overall structure. If the inspection finds that the parts are severely worn or the equipment is damaged, the disconnector should be inspected and evaluated, including the wear and aging of its mechanical parts, electrical parts and overall structure. If the performance degradation is obvious, necessary maintenance or replacement should be planned; when the working status is specifically manifested as abnormal phenomena at the knife switch, the isolating switch should be stopped immediately, and the relevant power supply should be cut off to ensure safety, and the knife switch should be inspected in detail to determine the specific cause of the abnormal phenomenon, such as whether it is caused by overload, short circuit or improper operation. According to the inspection results, take corresponding repair measures, such as replacing burned parts, adjusting the knife switch gap or lubricating mechanical parts; when the working status is specifically manifested as temperature and humidity conditions exceeding the safe range, the temperature and humidity sensors and should be checked. If the temperature and humidity sensor fails or the knife isolation control mechanism box is abnormal, it should be repaired or replaced in time. At the same time, take necessary measures to adjust the ambient temperature and humidity, such as using dehumidifiers, heaters and other equipment to ensure that the isolating switch is in a suitable working environment; if the working status is specifically manifested as the knife switch locking node is in a normal state, and the personnel electrically operate the isolation knife, and the isolation knife refuses to move, it can be determined that the isolating switch itself is faulty. If the working status is specifically manifested as the knife switch locking node is in an abnormal state, and the personnel electrically operate the isolation knife, and the isolation knife refuses to move, it can be determined that the fault is an external locking fault.

[0074] In the embodiment of the present invention, the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch and temperature and humidity information of the knife isolation control mechanism box of the isolating switch are obtained, and the associated switch related to the isolating switch is determined. The associated switch is a switch device that has a direct electrical connection or logical association with the isolating switch in the power grid and jointly realizes the circuit isolation, protection or control function. The real-time state of the knife switch locking node corresponding to the associated switch is identified, and the external locking node information is obtained. An analog relationship model between the motor current and the opening and closing angle is established in advance, and the theoretical current value range of the knife switch opening and closing process is predicted. In each monitoring cycle, according to the motor circuit current information and the opening and closing angle, the Closing angle information, compare the measured motor current value with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, the motor current is judged to be abnormal. Based on the motor circuit voltage information, motor circuit current information, opening and closing angle information, number of actions information, video information, temperature and humidity information, external locking node information, and the comparison results of motor current and opening and closing angle, the working status of the disconnector is determined. Based on the working status, it is judged whether the disconnector needs maintenance, which realizes intelligent judgment and maintenance warning of the working status of the disconnector, significantly improves the efficiency and safety of power grid operation and maintenance, and reduces the risk of failure and operation and maintenance costs.

[0075] The above describes the isolating switch monitoring method in the embodiment of the present invention. The following describes the network monitoring system in the embodiment of the present invention. Figure 4 In one embodiment of the present invention, a network monitoring system includes:

[0076] The network monitoring system 40 includes a switch monitoring subsystem 401 and an isolating switch control subsystem 402 which are in communication connection, the isolating switch control system 402 includes an isolating switch 4021 and an isolating switch control mechanism box 4022, and the network monitoring system 40 also includes an associated switch 403 which is directly connected to or logically associated with the isolating switch 4021;

[0077] The switch monitoring subsystem 401 is used to collect the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch, temperature and humidity information of the knife control mechanism box 4022, and external locking node information of the associated switch 403. The external locking node information includes the real-time status of the knife switch locking node corresponding to the associated switch 403, and pre-establishes an analogy relationship model between the motor current and the opening and closing angle and predicts the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, according to the motor circuit current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, it is determined that the motor current is abnormal. The working state of the isolating switch is determined according to the collected information and the comparison result of the motor current and the opening and closing angle, and it is judged whether the isolating switch needs to be repaired based on the working state.

[0078] In the embodiment of the present invention, the network monitoring system can analyze and accurately determine the working status of the isolating switch and whether maintenance is required in real time by comprehensively collecting real-time operating information of the isolating switch and its related components, including motor circuit parameters, opening and closing status, video monitoring, temperature and humidity environment, and external locking status of the associated switches, thereby effectively preventing faults from occurring and improving the reliability and safety of power grid operation.

[0079] See also Figure 5 Another embodiment of the network monitoring system in the embodiment of the present invention includes:

[0080] The network monitoring system 40 includes a switch monitoring subsystem 401 and an isolating switch control subsystem 402 which are in communication connection, the isolating switch control subsystem 402 includes an isolating switch 4021 and an isolating switch control mechanism box 4022, and the network monitoring system 40 also includes an associated switch which is directly connected to or logically associated with the isolating switch;

[0081] The switch monitoring subsystem 401 is used to collect the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch, temperature and humidity information of the knife control mechanism box, and the external locking node information of the associated switch 403. The external locking node information includes the real-time status of the knife switch locking node corresponding to the associated switch 403, and pre-establishes an analogy relationship model between the motor current and the opening and closing angle and predicts the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, according to the motor circuit current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, it is determined that the motor current is abnormal. The working state of the isolating switch is determined according to the collected information and the comparison result between the motor current and the opening and closing angle, and it is judged whether the isolating switch needs to be repaired based on the working state.

[0082] The isolating switch monitoring subsystem 401 includes a knife isolation monitoring controller 4011, and the knife isolation monitoring controller 4021 includes multiple first input units. The associated switch 403 includes multiple control circuits of knife switch locking nodes connected in parallel. The multiple first input units are respectively connected in series with the control circuits of the corresponding knife switch locking nodes to monitor the opening and closing status of each knife switch locking node, thereby obtaining external locking node information.

[0083] The isolating switch monitoring controller 4021 also includes a second input unit. The isolating switch 4021 includes a control circuit corresponding to the isolating switch opening and closing auxiliary node. The second input unit is connected in series with the control circuit where the isolating switch opening and closing auxiliary contact is located to monitor the number of operations of the isolating switch.

[0084] For example, Figure 6As shown, the knife isolation monitoring controller is designed to include 4 first open-input units, 1 second open-input unit and 1 third open-input unit connected in parallel, and the first normally closed open-output node and the second normally closed open-output node connected in series in the knife isolation motor circuit, the first normally closed open-output node and the second normally closed open-output node are connected in parallel, the 4 first open-input units are IX1 to IX4, the second open-input unit is IX5, the third open-input unit is IX6, the first normally closed open-output node is D01, and the second normally closed open-output node is D02; the four switches BS1 to BS4 represent four knife switch locking nodes respectively, BS1 is the knife switch locking node of the first grounding switch, BS2 is the knife switch locking node of the second grounding switch, BS3 is the knife switch locking node of the first circuit breaker, BS4 is the knife switch locking node of the second circuit breaker, GD1 is the auxiliary contact of the disconnecting switch, and the 4 first open-input units IX1 to IX4 are respectively connected in series in the control circuit where the four knife switch locking nodes BS1 to BS4 are located, so as to realize Collection of opening and closing information of four knife switch locking nodes; the first normally closed opening and closing node D01 and the second normally closed opening and closing node D02 are connected in parallel. This design provides redundancy and reliability. When the knife isolation monitoring controller detects that any of the four knife switch locking nodes BS1 to BS4 is in a disconnected state, it controls D01 to disconnect, thereby cutting off the knife isolation motor circuit to prevent electric operation, and sends relevant information to the background. When the personnel operate the knife isolation electrically and the knife isolation refuses to move, it can be quickly located whether it is an external locking fault or a fault in the isolating switch itself; the second input unit IX6 is connected in series with the control circuit where the auxiliary contact of the opening and closing of the IX5 isolating switch is located to realize the statistics of the number of isolating switch operations. The third input unit IX6 is used as a spare input unit in the knife isolation monitoring controller. Its main function is to provide additional flexibility and scalability so that new monitoring signals can be connected when needed or to respond to system upgrades, thereby enhancing the function and adaptability of the knife isolation monitoring controller.

[0085] In the embodiment of the present invention, the network monitoring system realizes comprehensive real-time monitoring of the isolating switch and its associated switches by integrating the switch monitoring subsystem and the isolating switch control subsystem, including key information such as motor circuit parameters, opening and closing status, number of operations, video monitoring, temperature and humidity, etc., which effectively improves the safety and reliability of power grid operation. At the same time, maintenance judgment based on data analysis reduces maintenance costs and improves operation and maintenance efficiency.

[0086] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for monitoring an isolating switch, characterized in that: The isolating switch monitoring method comprises: Obtain the motor circuit voltage information, motor circuit current information, opening and closing angle information, action times information, video information at the knife switch, and temperature and humidity information of the knife isolation control mechanism box of the isolating switch; Determine an associated switch related to the isolating switch, wherein the associated switch is a switch device that is directly electrically connected or logically associated with the isolating switch in the power grid and jointly implements circuit isolation, protection or control functions; Identify the real-time status of the knife switch locking node corresponding to the associated switch to obtain external locking node information; An analogy relationship model between the motor current and the opening and closing angle is established in advance, and the theoretical current value range of the knife switch opening and closing process is predicted. In each monitoring cycle, according to the motor loop current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, it is determined that the current of the motor is abnormal. Determine the working state of the disconnector based on the motor circuit voltage information, the motor circuit current information, the opening and closing angle information, the number of actions information, the video information, the temperature and humidity information, the external locking node information, and the comparison result between the motor current and the opening and closing angle; Based on the working status, it is determined whether the isolating switch needs to be repaired.

2. The isolating switch monitoring method according to claim 1, characterized in that: The determining of the working state of the disconnector based on the motor circuit voltage information, the motor circuit current information, the opening and closing angle information, the action number information, the video information, the temperature and humidity information, the external locking node information, and the comparison result between the motor current and the opening and closing angle includes: Analyze the motor circuit voltage information and current information to determine whether the motor is operating normally; Analyze the opening and closing angle information to determine whether the opening and closing positions of the disconnector are accurate; Analyze the action number information to evaluate the service life of the isolating switch; Analyze the video information to identify whether there is any abnormality at the knife switch; Analyze the temperature and humidity information to determine whether the environmental conditions of the isolating switch are suitable; Analyze the external locking node information to determine whether all the knife switch locking nodes are in a normal state; The working state of the isolating switch is determined based on the analysis result and the comparison result between the motor current and the opening and closing angles.

3. The isolating switch monitoring method according to claim 2, characterized in that: The analyzing the video information to identify whether there is an abnormality at the knife switch includes: Extracting key features corresponding to the image from the video information using image processing technology; The key features are compared with normal status data in the historical database to identify any abnormal phenomena that deviate from the normal range.

4. The isolating switch monitoring method according to claim 2, characterized in that: The analyzing the action number information to evaluate the service life of the isolating switch includes: Comparing the action number information with a preset action number threshold; If the number of actions approaches or reaches a preset threshold, it is evaluated that the service life of the disconnector is approaching or reaching the end.

5. The isolating switch monitoring method according to claim 2, characterized in that: Determining the working state of the isolating switch according to the analysis result and the comparison result between the motor current and the opening and closing angle includes: If the analysis results show any one or more of the following: abnormal motor circuit voltage or current, inaccurate opening and closing angles, abnormal analogy between motor current and opening and closing angles, nearing or reaching the end of the service life of the isolating switch, abnormalities at the knife switch, temperature and humidity conditions exceeding the safety range, or an abnormal state of the knife switch locking node, then the working state of the isolating switch is determined to be abnormal; otherwise, the working state of the isolating switch is determined to be normal.

6. The isolating switch monitoring method according to claim 1, characterized in that: The determining of the associated switch related to the isolation switch comprises: Analyzing the topology of the power grid and identifying switchgear that is directly electrically connected to the disconnector; Determining a switch device that is logically associated with the disconnector according to the operation logic and control strategy of the power grid; The identified directly connected and logically associated switching devices are used as associated switches associated with the disconnector.

7. The isolating switch monitoring method according to claim 1, characterized in that: The step of identifying the opening and closing state of the knife switch locking node corresponding to the associated switch to obtain the external locking node information includes: Monitoring the real-time status of the switch locking node corresponding to the associated switch; When any knife switch locking node is detected to be in an abnormal state, the state information of the knife switch locking node in the abnormal state is recorded; The switch locking node status information of all identified associated switches is integrated to obtain the external locking node information.

8. A network monitoring system, characterized in that: The network monitoring system includes a switch monitoring subsystem and an isolating switch control subsystem connected in communication, the isolating switch control system includes an isolating switch and an isolating switch control mechanism box, and the network monitoring system also includes an associated switch directly connected to or logically associated with the isolating switch; The switch monitoring subsystem is used to collect the motor circuit voltage information, motor circuit current information, opening and closing angle information, action number information, video information at the knife switch, temperature and humidity information of the knife control mechanism box, and external locking node information of the associated switch. The external locking node information includes the real-time status of the knife switch locking node corresponding to the associated switch, and pre-establishes an analogy relationship model between the motor current and the opening and closing angle and predicts the theoretical current value range of the knife switch opening and closing process. In each monitoring cycle, according to the motor circuit current information and the opening and closing angle information, the measured motor current value is compared with the theoretical current value range corresponding to the opening and closing angle information collected in real time. If the measured motor current value deviates from the theoretical current value range, it is determined that the current of the motor is abnormal. The working state of the isolating switch is determined according to the collected information and the comparison result between the motor current and the opening and closing angle, and it is determined whether the isolating switch needs to be repaired based on the working state.

9. The network monitoring system according to claim 8, characterized in that: The isolating switch monitoring subsystem includes a knife switch monitoring controller, which includes multiple first input units. The associated switch includes multiple control circuits of knife switch locking nodes connected in parallel. The multiple first input units are respectively connected in series with the control circuits of the corresponding knife switch locking nodes to monitor the opening and closing status of each knife switch locking node, thereby obtaining external locking node information.

10. The network monitoring system according to claim 9, characterized in that: The isolating switch monitoring controller also includes a second input unit, and the isolating switch includes a control circuit corresponding to the isolating switch opening and closing auxiliary node. The second input unit is connected in series with the control circuit where the isolating switch opening and closing auxiliary contact is located to monitor the number of operations of the isolating switch.

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